Hypodermic syringe.



FAIRLEIGH S. DICKINSON', OF RUTHERFORD, NEW JERSEY.

HYPODERMIC SYRINGE. i

LELMLUSS.

Specification of Letters Patent. Patented Sept., 111i, LDI'?.

Application filed December 9, 1916. Serial No. 135,961.

to allow the needle to flex in a lateral direction thus preventing breaking of the needle.

In order to accomplish the desired result, use is made-of a cup-shaped attaching and packing member in which the butt end of the needle is secured, the said attaching and packing member fitting onto the end of the nozzle and being pressed in packing engagement with the same by a couplin cap. In order to allow iexing of the need e the bore in the coupling cap is provided with a ilaring mouth to allow the needle to iex and to limit the flexing movement. A

'A practical embodiment of the invention is represented in the accompanying drawings forming apart of this specification, in which similar characters of reference indicate correspondingparts in all the views.

Figure l is a plan view of the improved hypodermic syringe;

Flg. 2 is an enlarged sectional plan View of the same; and

Fig. 3 ,is a perspective view of the needle and its attaching and packingmember.

The hypodermic syringe in lts general construction consists of a barrel 10 in which is mounted to reciprocate'a piston or plunger 11 having its plunger rod 12 guided in a cap 13 screwed or otherwise secured on the inner end of the barrel 10- adjacent the usual iingerpiece 14. In the outer end of the barrel 10 is secured a nozzle 15 having duced portion 16 engaged by a coupllng nut 17 screwing on the outer end of the barrel 10 to hold the nozzle 15 in place. rIhe nozzle 15 is provided with a central bore 20 into the outer end of which projects the butt end 21 of a hypodermic needle 22 secured at its butt in the bottom of a cup-shaped attaching and packing member 23 seated in a seat 24 formed in a coupling cap 25 screwing on the threaded portion 26 ofthe nozzle 15. The open end of the attaching and packing member 23 fits onto the reduced end Imember 23 is preferably made of a softer metal than that of which the nozzle 15 is made so that when the attaching and packing member 23 is in position in the coupling A cap 25y and the latter is screwed up on the threaded portion 26 of the nozzle l5 then the said attaching and packing member 23 is firmly forced onto the reduced end 27 of the nozzle 15 to form a non-leaking joint.

The terminal of the butt end of the hypodermic needle 22 is approximately flush with the .open end of the attaching and packing member 23 so that when the parts are in position as shown in Fig. 2 then the terminal portion ofthe needle 22- extends into the bore 20 of the nozzle lo. Thus by the'arrangement described the liquid forced out of the barrel 10 by way of the bore 20 passes directly into the hypodermic needle 22 and out of the same at the vpointed end thereof. Any liquid that leaks past the butt terminal of the needle 22 into the attaching and pack- -ing member 23 is confined therein as an exceedingly tight packingjoint exists between the said vmember 23 and the nozzle end 27. The hypodermic needle 22 extends through a, bore 30 formed centrally in the coupling cap 25, and this bore`30 is provided with a flaring mouth 31| to allow the shank of the l needle 22 to Hex laterally in any direction, the cap 25 thus forming a guard for the needle.

It is understood that when the coupling cap 25 is screwed up then the attaching and packing member 23 is carried along by the said cap 25 and forced onto the end 27 of the nozzle 15, and as the said member 23 is conical and of soft metal it is evident that the attaching and packing member 23 is capable of opening up and spreading to lit snugly onto the outer surface of the nozzle end 27 thus forming an exceedingly tight joint to prevent leakage. It will also be noticed that by the arrangement described the Various parts can be readily assembled ordisassembled for cleaning and other purposes. It will further be noticed-that a broken or otherwise injured 'needle can be von the nozzle the needle is centrally fastened in place.

Although I have shown and described a preferred form of my invention I do not limit myself to the exact construction disclosed as the s'ame may be varied as to minor details without departing from my invention.v

Having thusdescribed my invention, I claim as new and desire to secure by Letters Patent l. In a hypodermic syringe, a needle and' a cup-shaped attaching and packing member in which the butt end of the needle is secured, a nozzle onto which fits the said attaching and packing member, and a coupling cap screwing on the said nozzle and engaging the said attaching and packing member to force the latter firmly into postion on the nozzle.

2. In a hypodermic syringe, a needle and a cup-shaped attaching and packing member in which the butt end of the needle is secured, a nozzle onto which fits the said attaching and packing member, and a coupling cap screwing on the said nozzle and engaging the said attaching and packing member to force the latter firmly into position on the nozzle, the said coupling cap having a central bore for the passage of the said needle.

3. In a 'hypodermic syringe, a needle and a cup-shaped attaching and )acking member in which the butt end oi the needle is secured, a 'nozzle onto which lits the said attaching and packing members, and a coupling cap screwing on the said nozzle and engaging the said attaching and packing member to force the latter firmly into position on the nozzle, the said coupling cap having a central bore for the passage of the said needle, the bore gradually increasing in size in an outward dn'ection to allow the needle to flex laterally in any direction and to form a needle guard to limit the flexing movement of the needle.

4. In'a hypodermic syringe, a barrel, a nozzle on the end of the said barrel and having a reduced end, a needle, a cup-shaped attaching and packing member in which the butt end of the needle is secured, the said attaching and packing member engaging the said nozzle end, a coupling cap screwing on the'said nozzle and having a seat for the said attaching and packing member to force the latter into packing position on the said nozzle end.

5. In a'hypodermic syringe, a barrel, a nozzle on the end of the said barrel and having a reduced end, a needle, a cup-shaped attaching and packing member in which the butt end of the needle is secured, the terminal of the butt end of the needle extending into the bore of the said nozzle, the said attaching and packing member engaging the said nozzle end, and a coupling screwing on the said nozzle and having a seat for the said attaching and packing member to force the latter into packing position on the said nozzle end. y

6. In a. hypodermic syringe, a barrel, a nozzle on the end of the said barrel and having a reduced end, a needle, a cup-shaped attaching and packing lmember in which the butt end of the needle is secured, the said attaching and packing member tting onto the said nozzle the contacting surfaces of the said nozzle end and the said attaching and packing member being tapering, and a coupling cap screwing on the said nozzle and having a seat for the said attaching and packing member to force the latter into packing position on the said nozzle end.

7. In a hypodermic syringe, a needle and an attaching and packing member made of a single piece of soft metal and having a central bore and having a cup-shaped recess connected at its bottom with the inner end of the said bore, the 'butt of the needle being secured in the said bore.

8. In a hypodermic syringe, a needle and a cup-shaped attaching and packing member in Which the butt end of the needle is centrally secured, the saidattaching and packing member being of soft metal.

9. In a hypodermic syringe, a needle and an attaching and packing member made of a single piece of soft metal and having a central bore and having a cup-shaped recess connected at its bottom with the inner end of the said bore, the butt of the needle being secured in the said bore and having a portion extending centrally in the said recess, the terminal of the needle butt being approximately flush With the open end ofv the said attaching and packing mem'ber.

l0. In a hypodermic needle, a needle having at its butt end a cup-shaped attaching and packing member and a coupling cap having a seat for the said attaching and packing member and having a bore for the needle to pass through, the said bore having a flaring mouth to allow the needle to fiex and to limit the flexing movement of the needle.

11. In a hypodermic needle, a needle and guard having a borre through which projects the shank of the needle, the said bore having a flaring mouth to allow the outer portion of the needle to flex.

FAIRLEIGH S. DICKINSON.

los 

